S = input()
if ("RRR" in S):
  print("3")
elif ("RR" in S):
  print("2")
elif ("R" in S):
  print("1")
else:
  print("0") S = input() S input() input if ("RRR" in S):
  print("3")
elif ("RR" in S):
  print("2")
elif ("R" in S):
  print("1")
else:
  print("0") "RRR" in S "RRR" S print("3") print "3" elif ("RR" in S):
  print("2") "RR" in S "RR" S print("2") print "2" elif ("R" in S):
  print("1") "R" in S "R" S print("1") print "1" print("0") print "0" S = input() input() S
S = input()
if ("RRR" in S):
  print("3")
elif ("RR" in S):
  print("2")
elif ("R" in S):
  print("1")
else:
  print("0")